After some seconds of worry, the Prime ministerial team's concerns are allayed when they discover Lucy's in a nearby toy store, shopping for Jack.

"Oh. I think she's gone to a toy store," says Turnbull, with the pair reunited inside the store soon afterwards.

The moment of realness comes as Turnbull visits the South Australian capital in a bid to hose down the threat from senator Nick Xenophon and his nascent political party, which is building momentum in the state.

Turnbull has been urging voters to back the Coalition's "calm heads" and steer away from backing independent candidates.